Propeller ventilating motor



l 646 578 Oct. 25, 1927. F. CHARAVAY l a r f PROPELLER VENTILATING MOTOR Filed May 11. 1926 v INVENTOR,

3l, ATTURNEY.

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Paura-Lann vnisrinn'rme Moron.

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This invention relates to new 'and useful improvements in propeller Ventilating motors.

`It is the. to provide tor that operates rincipal object of my invention or attachment to an electric moa Ventilating pro eller, a shield to prevent the entrance of irt, lint or other foreign matter to the motor when the propeller is rotated.

If my shield is not applied to such an electric motor eand the propeller is rotated by. it, the direct blast of air pulled from a. room for other enclosure ter the rear end of the motor to oppose-the cooling stream of air generated by the fan within it. This opposing blast of air not only slows up the circulation of the cooling i air through the motor, but carries into the latten foreign particles such as lint, dust and 'dirt togum up and befoul the motor mechanism.

It is, therefore, the principal purpose'of my invention to provide a shield not only to prevent the entrance of foreign matter to the motor, but to divert the direct blast of air around it in such a way as to create a vacuum at the ends of the shield to accelerate the flow of cooling air throu h the mo- :tor. This cooling air generated y the fan lwithin .the motor is now free to pass from the rear end of it without being opposed by the direct blast of air pulled b the propeller from a room or other enc osure, nor will any of the foreign particles within that air be permitted by the shield to enter the motor, either at the rear vor at the vfront of it, the inertia of those particles in the latter instance carrying them be ond its frontend.

In the accompanying rawings illustrat7 ing my invention', Figure 1 is a rear view of the propeller unit, showing my foreign particle diverting shield attached to the motor. Figure 2 isa side view of the same. Figure 3 is an enlarged side `view of 'the motor, showing my oreign article v delector attached thereto. Arnd4 igure 4. is a lon tndinal sectional view foreign particle deflector on the line 4-4 ofFi rc3;

` Re erring to the a'ccompan in drawings for a detailed description'of t e orm of embodiment of my invention'illustrated therein, the' numeral 1 designates a motor holding ring-frame to which there is suitably seu cured l a diametric supporting member by the propeller will en'-l erarly of greater streamv o fan within the taken through t e' ticlesr` intoth'e motor.

The middle portion of the latter is enlarged to provide for an electric motor 3 a wide, flat support` 4 from which there projects downwardly to the lower end of the, ring 1 a radial bracing piece 5. The motor holding litiasis-f PATENT oFrica.

GEORGE frame just described may be varied in its construction, any suitable manner in a enclosure.

The motor 3 has an armature shaft 6 to whose outer end there is securely attached a Ventilating pr'opeller 7 that may be of aerofoil or other section. This propeller is preflength than the air-discharge opening enclosed by the-ring 1 to prevent the' return of air through the latter for entrance behind the propeller to destroy the vacuum which enables 1t to pull or exhaust the foreign particle laden4 air from a duct, room or other enclosure.

For the purpose of preventing frei inatterbeing carried into the motor b t e air which is pulled from an enclosure being ventilated by the ropeller 7 and to assist the passage throug the motor of the cooling air generated by the fan (not shown) within it, I have provided for attachment to the motor 3, of a shield such as the metal shield 8, behind its air exhaust opening. The shield 8 preferably comprises a channel member or casting which conforms to the contour ofthe rear end of the motor 3 and (projects at each end a short dis tance'beyon it. Formed on the lowei` corners of this channel member 8 are-apertured ears 9, 9 through which screws 1o am passed into the motor uwall to firmly secure duct, room or other the latter.

d 8 forms with the outer surface of the motor walla passage through which the cooling stream of air generated by the motor may freely 'and uninterruptedl filow to the: atmosphere as indicatedby t e arrows in.- Figure 4.

Ae will vbe fobserv'ed'from Figure 1, the shield 8 is of sucient width tov prevent the entrance of. dirt, lint and other foreign par- .The shie blast of air laden withthese pulled toward the' motor by t e'propeller 7, will be diverted by* the shield 8 around it, carrying them, through the inertia acquired,

.far past the motor to prevent their yturning 2. around toenter it vfrom .the front, 110

y said channel member or shield to the motor with# out alterin Instead, the direct. articles, when if desired, and supported in p The outward rush of this direct blast of foreign particle ladenair will also create a sufficient vacuum around the open ends of terior.

the shield 8 to accelerate the passage of the motor cooling air through them to the atmosphere, whereas, if no shield were provided, thiscooling stream would be opposed Within the motor by that blast. It is thus seen that my shield not only prevents the entrance of dust, lint and other foreign particles into the motor to befoul its mechanism, but also assists the passage of the air generated by the fan through the motor to cool My shield may be applied to any type of motor that may be used for Ventilating purposes, and ma be constructed of suflicient size to be emp oyed with a motor having 'an open frame.

Having described my invention, I claim:

1. The combination with an electric motor, of a Ventilating rotor operated by said motor in front of one end of it, and a channel member applied to the other end of said motor and having on each side an open extension communicating with the motor in 2. The combination with an electric motor including an armature shaft, of a ventilating propeller secured to the front end of said shaft, said motor having a rear vent opening, and a channel member applied to the rear end of said motor over its vent opening and open at each end to the atmosphere for the purpose specified.

8. The combination with an electric motor including an armature shaft, of a Ventilating propeller ysecured to the front end of said shaft, said motor having a rear vent opening,`and a channel member applied to the rear end-of said motor over its vent opening and projecting be ond each side of the motor into the path o the air pulled toward the latter by the propeller, for the purpose specified. v

4. The combination with an electric motor including an armature shaft, of a ventilatin propellersecured to the front end of sai shaft, said motor having a rear vent opening, a channel member adapted to cover said vent opening and formed vWith apertured ears, and fastening elements pro]ect ing through said ears into the motor wall to secure said channel member firmly therej to for the purpose specified.

In testimony vvhereoil I have hereunto set my hand this 10th day of May, 1926.

FREDERICK CHARAVAY, 

